Steel retainer



June 12, 1934. F M SLA-[ER 1,962,790

y STEEL RETAINER Filed Jan. ll, 1934 15' 30 2 E0 x f 22 P 5 25 E 50 D aff 2l`\ /f 4'5 44 B7 44! /V/ W 45 8/// f 4l U l E /7 5.9 f 3659 9- /45 7/ l J7 E j 6/ 415 45 J0 40 418 .z5/' d 4.9

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HIS ATTORNEY.

A t 20 designates a cylinder of a rock drill and 21 Patented June 12, 1934 PATENT OFFICE STEEL RETAINER Fred M. Slater, Easton, Pa., assignor to Ingersoll- Rand Company, Jersey City, N. J., a corporation of New JerseyT Application January 11, 1934, Serial No. 706,215

3 Claims.

This invention relates to rock drills, but more particularly to a steel retainer adapted to be attached to rock drills of the type in which the piston and the Working implement actuated by the piston are free to reciprocate independently Yof each other.

The objects of the invention are to protect the retainer parts and the portions of the rock drill whereby the retainer is guided against the Veffects of wear, to enable the retainer to be readily attached to or detached from the rock drill `rconstructed in accordance with the practice of the invention,

Figure 2 is a front elevation, partly in section, of the forward end of a rock drill and the retainer, and

Figure 3 is a side view, in elevation, of portions of the rock drill and the retainer and showing the retainer in position to permit withdrawal of the working implement from the rock drill.

Referring more particularly to the drawing,

a front head connected to the cylinder 2) by side rods 22. A front cylinder washer 23 interposed between the cylinder and the front head,

and extending partly into both, serves as a closure for the front end of the cylinder 2G and as a guide for the stern 24 of a hammer piston 25 reciprocable in the cylinder 20.

The front head 2l encases chuck mechanism comprising, in the present instance, a chuck w26 disposed in the front end of the front head 2l to rotate therein. On the rearward end of the chuck are clutch jaws 27 which engage clutch jaws 28 carried by a chuck nut 29 having Y the usual internal ribs (not shown) for engage- Vment with flutes 30 in the stem 24 of the piston. Thus, upon rotation of the piston 25, rotary movement will be transmitted to the chuck 26 for rotating a working implement 31 extending into the chuck to receive the blows of the nhammer piston.

Lin the chuck 26. At the juncture of the shank 33 and the body portion 34 of the working implement is a collar 35which seats against the front end of the chuck 26 to limit the distance which the working implement may extend into the rock drill. Y

On-the side of the front head 21 is an enlargement 36 having an aperture 37 of oblong shape and terminating at its rearward end in an enlarged cylindrical portion 38. The front end of the aperture 37 is preferably of semi-cylindrical shape and opposed flat parallel surfaces 39 tangent thereto extend rearwardly to the enlarged portion 38. v

Disposed in the intermediate portion of the aperture 37 and between the flat surfaces 39 is a shaft 4G of which the ends project beyond' the sides of theV enlargement 36 and serve as pivots for side arms 4l joined at their forward ends by a yoke 42 which partly encircles the working implement forwardly of the lcollar 35.

In diameter, the shaft 40 is only slightly smaller than the enlarged portion 38 of the aperture to permit of free insertion o the shaft into said enlarged portion. On opposite sides of the shaft are flat surfaces 43 which are of slightly greater length than the width of the enlargement 36 and such iiat surfaces slidably engage the surfaces 39 of the' aperture to prevent rotary movement of the shaft 40 upon such movement of the yoke 42.

To the end that the yoke 42 may be suitably locked in the retaining position wherein said yoke lies in the path of the collar 35 notches 44 are formed in the rear ends of the side arms 41 to engage the ends 45 of a pin 46. In the assembled position the pin 46 lies in the enlarged portion 38 of the aperture, and at the juncture of the ends 45 and the body portion of the pin are shoulders 47 which may engage the inner surfaces of the side arms to retain the pin 46 in the aperture 37.

In order to suitably cushion the yoke 42 upon impact of the collar 35 thereagainst a rubber buffer 48, having a series of transverse apertures 39 is disposed in the front end of the aperture 37. The iront end of the buffer is suitably shaped to conform to that end of the aperture 37, and in the rear end of the buffer is a concave surface 50 which seats against the shaft 40. Preferably the buffer 48 is of such length that, upon assembly of the retaining device on the rock drill, the buffer will be compressed somewhat and thus, by acting against the shaft 40, maintain the notches 44 firmly interlocked with the ends 45 of the pin 46.

In assembling the retaining device on the rock drill the buffer 48 is rst placed in the aperture 37. The shaft 40 is then inserted in the enlarged portion 38 and the side arms and positioned to enter between the flat surfaces 39 after which the yoke may be lowered until the shaft rests upon the buffer 48. If then the yoke 42 is pulled downwardly to compress the buffer 48 somewhat the pin 46 may be readily inserted in the enlarged portion 38 and upon release of the yoke 42 the notches 44 will engage the ends 45 of the pin 46 to lock the yoke in retaining position.

In operation, whenever it is desired to change Working implements the yoke 42 is rocked out of the retaining position and the collar 35 may then readily pass the retaining portion of the yoke. In its releasing position the yoke is held stationary by the ends 45 of the pin and after another drill steel has been inserted in the chuck 26 the yoke may again be rocked to its retaining position and will be held there by the interlocking portions of the pin 46 and the Aside arms.

From the foregoing description it will be readily seen that only a few parts, of simplified construction, are required to anchor the yoke securely to the front head and that all wearing surfaces of the parts may be of ample proportions. This is particularly true of the cooperating surfaces of the shaft 40 and the aperture 37. Inasmuch as these parts are subjected to severe usage and, therefore, constant Wear it is essential that the effects of such wear be minimized so the device may withstand long periods of service without necessitating frequent replacements of parts.

I claim 1. A steel retainer for a rock drill, comprising in combination with a front head and a drill steel, an enlargement on the front head having an aperture, a yoke for retaining the drill steel in the front head, side arms on the yoke, a pin in one end of the aperture engaging the side arms to lock the yoke in position, a shaft in the aperture engaging the side arms to serve as a pivot for the yoke, and a rubber buffer in the opposite end of the recess acting against the shaft to cushion the yoke and to press the side arms into interlocking engagement with the pm.

2. A steel retainer for a rock drill, comprising in combination with a front head and a drill steel, an enlargement on the front head having an aperture, a yoke for retaining the drill steel in the'front head, side arms on the yoke having notches in the ends thereof, a pin in an end of the aperture interlockingly engaging the notches and having shoulders to engage the side arms for retaining the pin in the aperture, a shaft in the aperture extending into the arms to serve as a pivot for the yoke, and a rubber buiier in the other end of the recess acting against the pin to cushion the yoke and to press the notches against the pin.

3. A steel retainer for a rock drill, comprising in combination with a iront head and a drill steel, an enlargement on the front head having an aperture and an enlarged portion in the aperture, a yoke for retaining the drill steel in the iront head, side arms on the yoke having notches in the ends thereof, a pin in the en larged portion of the aperture engaging the notches and having shoulders to engage the side arms for retaining the pin in the aperture, a shaft in the aperture engaging the side arms to serve as a pivot for the yoke and having flat surfaces engaging the sides of the aperture to prevent rotary movement or the shaft 1 in the aperture, and a rubber buffer in the aperture acting against the shaft to cushion the yoke and to maintain the notches in interlocking engagement with the pin.

FRED M. SLATER.

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